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'. OU1132 . . Creek, South Boulder Creek, and its other tributaries. The proceedings were watched but the District had no claims for appropriations from those streams which at this time were ready to present. They have an indirect bearing on St. Vrain Creek. III. COLORADO RIVER WATER SUPPLIES A. Leeds. Hill and Jewett Report on Colorado River Supplies This:report, to the Colorado Water Conservation Board, is dated October 31, 1973. It was of a study which this eminent firm of water supply engineers ,was employed to make of the water resources available from surfalJe supplies of the West Slope of Colorado, and of the present and potential uses thereof in Colorado, under the laW, including compacts affecting the use of said water. Trans-mountain diversions to the extent capable without injury to the potential economic development of the natural watershed were analyzed. These engineers point out some factors realized since the Colorado River Compact of 1922. These are that the de- pendable average annual flow at Lee Ferry, instead of the 17,900,000 acre feet then assumed, was only 11,700,000 acre feet in the 10 years just ended, and was as low as 4,400,000 acre feet in one year. They point out that the Upper Basin States, in the compact guarantee that the Upper division will not deplete the flow at Lee Ferry below 77,000,000 acre feet in a 10 year period. This compels a reduction in estimate of the supplies available to the Upper Basin users, of which Colorado, by the Upper Basin Compact, gets ?l%. Therein the engineers compute (a) the total amount annually available for use in Colorado as 3,100,000 acre feet; (b) present depletions aggregate 1,470,000 acre feet; (c) assuming the Colorado-Big Thompson diversions, including evaporation losses, as 388,200 acre feet yearly; (d) there are other committed supplies of about 200,000 acre feet, which -24_ ----- -'